Table 4.
Indices of heart rate variability at baseline and at the end of the study
| Variable | Group | Pre | Post | Delta (∆) | p (pre vs. post) | p (dif.) |
|---|---|---|---|---|---|---|
| SDNN (ms. mean ± SD) | GC (n = 19) | 126.4 ± 31.3 | 137.9 ± 43.0 | 11.5 ± 30.0 | 0.112 | 0.102 |
| GI (n = 18) | 163.9 ± 54.7 | 160.2 ± 50.0 | -3.7 ± 25.1 | 0.536 | ||
| rMSSD (ms. median IQ) | GC (n = 19) | 27 (23-44) | 39 (19-53) | 2 (-6-17) | 0.542 | 0.429 |
| GI (n = 18) | 44(30-83) | 41 (32-74) | -1 (-21-9) | 0.678 | ||
| TP (Hz. median IQ) | GC (n = 19) | 1526 (709-2850) | 2423 (1132-4234) | 943 (-731-3130) | 0.091 | 0.521 |
| GI (n = 18) | 1653 (625-3418) | 2794 (1617-4452) | 1780 (921-2743) | 0.017* | ||
| VLFP (Hz. median IQ) | GC (n = 19) | 666 (427-1230) | 1215 (527-3003) | 682 (-208-2019) | 0.126 | 0.849 |
| GI (n = 18) | 586 (290-1565) | 815 (610-1425) | 371 (27-1171) | 0.047* | ||
| LFP (Hz. median IQ) | GC (n = 19) | 124 (77-447) | 202 (50-482) | -1.0 (-150-197) | 0.629 | 0.849 |
| GI (n = 18) | 192 (38-418) | 161 (76-292) | 60 (-111-146) | 0.733 | ||
| HFP (Hz. median IQ) | GC (n = 19) | 166 (86-291) | 154 (62-422) | -42 (-133-92) | 0.494 | 0.083 |
| GI (n = 18) | 190 (87-443) | 256 (207-462) | 79 (-61-328) | 0.156 |
SD: standard-deviation; CG: control group; IG: intervention group; HFP: high-frequency power; IQ: interquartile range (25-75); LFP: low-frequency power; pre-post: comparison of the results of the group at the beginning and end of the study; rMSSD: root mean square of successive differences; SDNN: standard deviation of NN intervals; TP: total power; VLFP: very low-frequency power.
*
Statistically significant p value.